In 2015 he was elected as Fellow of the Royal Society of Chemistry and became Associate Editor of RSC Advances.
Stepan Stepanovi?, Ljubica Andjelkovi?, Matija Zlatar, Katarina Andjelkovi?, Maja Gruden-Pavlovi?, Marcel Swart
Role of Spin State and Ligand Charge in Coordination Patterns in Complexes of 2,6-Diacetylpyridinebis(semioxamazide) with 3d-Block Metal Ions: A Density Functional Theory Study
Inorg. Chem. 2013, 52, 13415-13423
A change in oxidation state of iron: scandium is not innocent
Chem. Commun. 2013, 49, 6650-6652
Accurate spin-state energies for iron complexes
J. Chem. Theory Comput. 2008, 4, 2057-2066
M. Swart, A.R. Groenhof, A.W. Ehlers and K. Lammertsma
Validation of exchange-correlation functionals for spin states of iron-complexes
J. Phys. Chem. A 2004, 108, 5479-5483
It has long been recognized that metal spin states play a central role in the reactivity of important biomolecules and in inorganic chemistry catalysis. Molecules with different numbers of unpaired electrons, hence with different spin states, have distinct geometric structures, energetic properties and reactivity. Elucidating the role and effect of different spin states on the properties of a system is presently one of the most challenging endeavors both from an experimental and theoretical point-of-view. This is in particular true for reaction mechanisms where the spin-state and/or oxidation state of a metal can change during the reaction. It has been described extensively in the recent Wiley book on “Spin states in Biochemistry and inorganic chemistry: Influence on Structure and Reactivity” (Eds: M. Swart, M. Costas).
The reaction mechanism of chemical processes with transition-metals can (and often does) involve a switching from one spin-state to another during the reaction. This allows to overcome the low activity of molecules like dioxygen (in its triplet state), and facilitates reactions that would otherwise be spin-forbidden. Moreover, given the wide range of mechanistic possibilities available with the presence of transition-metals, often a multitude of reaction mechanisms has to be considered. In collaboration with experimental groups we are carrying out computational chemistry experiments to characterize intermediates and transition structures, to determine the most favorable reaction path.
In 2010 a ground-breaking experimental study by Fukuzumi and Nam was published in Nature Chemistry where they showed that adding Sc(OTf)3 to a FeIV-oxo complex (with the TMC ligand) has unprecedented consequences: (i) the axial ligand of iron is removed; (ii) scandium picks up a fourth triflate and an additional fifth axial ligand; (iii) the methyl groups of the TMC-ligand flip upwards (from anti towards oxo, to syn); and (iv) this interaction facilitates a two-electron reduction by ferrocene, instead of the one-electron reduction without the Lewis acid. This has opened a whole new research area where reactive species can be stabilized, or reactivity can be drastically improved. The effect of the Lewis acids on the stability, reactivity and spectroscopic properties is poorly understood, and is being studied here in collaboration with experimental groups.
In order to be able to carry out the spinning around in transition-metal chemistry, new research tools have been developed such as the QUILD program with improved optimization and transition-search routines, and new density functionals (S12g, SSB-D) that work well for both spin states and weak interactions. The advantage of these tools is that they can be applied straightforwardly also to other systems such as DNA, SN2-reactions, NMR chemical shifts and the like
ICREA Research Professor
PhD student (FPI)Supervisor:
PhD student (FI)Supervisor:
PhD student (FPI)Supervisor:
This week a new book on “Spin states in Biochemistry and Inorganic Chemistry:
ICREA Research Professor Marcel Swart has recently been selected as a Fellow of
The Institute of Computational Chemistry and Catalysis of the University of Girona organizes the 1st Science
Prof. Marcel Swart participates in the continuation of the International Dialogue Project by